770G and 772G Off-Highway Truck Systems Caterpillar


Torque Converter Lockup Clutch Supply Pressure - Test and Adjust

Usage:

770G ECM

表 1
所需工具     数量    
6V-3079 压力软管组件     1    
6V-4143 连接器组件     2    
8T-0856 压力表 (
6000 kPa (870 psi))    
1    

注: 在您进行任何压力测试之前,确保滤清器和滤网清洁。 在您进行本测试之前,确保油处于工作温度。

------ WARNING! ------

机器突然移动,会造成人员伤亡。

机器突然移动或释放气压或油压,可能对机器上或机器附近的人员造成伤害。

在测试和调整任何空气系统或液压系统之前,为防止可能的伤害,执行测试和调整, "概述"部分的程序。


如果存在,本测试会显示是否存在下列情况:

  • 变矩器锁定离合器调制阀接收到的供油流量正确

  • 动力传动系齿轮泵工作正常

步骤




图 1g02421556

770G 上的变速箱左侧视图

(1) 变矩器闭锁离合器调节阀

(2) 变矩器锁定离合器调节阀测压口




图 2g02421557

772G 上的变矩器后视图

(1) 变矩器闭锁离合器调节阀

(2) 变矩器锁定离合器调节阀测压口

  1. 拆下测压孔 (A) 上的螺塞。 在拆下螺塞的位置安装螺纹接头。

  1. 利用连接器和软管将 8T-0856 压力表 (6000 kPa (870 psi)) 连接到螺纹接头上。

  1. 在停车制动器接合的同时起动发动机。 让变速箱处于空档,使发动机在 1700 rpm 下运行。 压力表上的压力必须为 2068 ± 69 kPa (300 ± 10 psi)。

  1. 当本测试完成后,关闭发动机,卸下测试设备。

油压过低

可能的原因

  • 动力传动系泵的充油段出现故障。

  • 变矩器锁定离合器调制阀设定值过低。

  • 变矩器锁定离合器和电磁阀的供油管路堵塞。

油压过高

可能的原因

变矩器锁定离合器调制阀设定值过高。

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